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package org.bouncycastle.crypto.tls;
import java.io.IOException;
import org.bouncycastle.util.Strings;
public final class ProtocolVersion
{
public static final ProtocolVersion SSLv3 = new ProtocolVersion(0x0300, "SSL 3.0");
public static final ProtocolVersion TLSv10 = new ProtocolVersion(0x0301, "TLS 1.0");
public static final ProtocolVersion TLSv11 = new ProtocolVersion(0x0302, "TLS 1.1");
public static final ProtocolVersion TLSv12 = new ProtocolVersion(0x0303, "TLS 1.2");
public static final ProtocolVersion DTLSv10 = new ProtocolVersion(0xFEFF, "DTLS 1.0");
public static final ProtocolVersion DTLSv12 = new ProtocolVersion(0xFEFD, "DTLS 1.2");
private int version;
private String name;
private ProtocolVersion(int v, String name)
{
this.version = v & 0xffff;
this.name = name;
}
public int getFullVersion()
{
return version;
}
public int getMajorVersion()
{
return version >> 8;
}
public int getMinorVersion()
{
return version & 0xff;
}
public boolean isDTLS()
{
return getMajorVersion() == 0xFE;
}
public boolean isSSL()
{
return this == SSLv3;
}
public boolean isTLS()
{
return getMajorVersion() == 0x03;
}
public ProtocolVersion getEquivalentTLSVersion()
{
if (!isDTLS())
{
return this;
}
if (this == DTLSv10)
{
return TLSv11;
}
return TLSv12;
}
public boolean isEqualOrEarlierVersionOf(ProtocolVersion version)
{
if (getMajorVersion() != version.getMajorVersion())
{
return false;
}
int diffMinorVersion = version.getMinorVersion() - getMinorVersion();
return isDTLS() ? diffMinorVersion <= 0 : diffMinorVersion >= 0;
}
public boolean isLaterVersionOf(ProtocolVersion version)
{
if (getMajorVersion() != version.getMajorVersion())
{
return false;
}
int diffMinorVersion = version.getMinorVersion() - getMinorVersion();
return isDTLS() ? diffMinorVersion > 0 : diffMinorVersion < 0;
}
public boolean equals(Object other)
{
return this == other || (other instanceof ProtocolVersion && equals((ProtocolVersion)other));
}
public boolean equals(ProtocolVersion other)
{
return other != null && this.version == other.version;
}
public int hashCode()
{
return version;
}
public static ProtocolVersion get(int major, int minor)
throws IOException
{
switch (major)
{
case 0x03:
{
switch (minor)
{
case 0x00:
return SSLv3;
case 0x01:
return TLSv10;
case 0x02:
return TLSv11;
case 0x03:
return TLSv12;
}
return getUnknownVersion(major, minor, "TLS");
}
case 0xFE:
{
switch (minor)
{
case 0xFF:
return DTLSv10;
case 0xFE:
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
case 0xFD:
return DTLSv12;
}
return getUnknownVersion(major, minor, "DTLS");
}
default:
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
}
}
public String toString()
{
return name;
}
private static ProtocolVersion getUnknownVersion(int major, int minor, String prefix)
throws IOException
{
TlsUtils.checkUint8(major);
TlsUtils.checkUint8(minor);
int v = (major << 8) | minor;
String hex = Strings.toUpperCase(Integer.toHexString(0x10000 | v).substring(1));
return new ProtocolVersion(v, prefix + " 0x" + hex);
}
}
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